Required reading: 

Meeus, L. (2020): The Evolution of Electricity Markets in Europe, 2-24. 

Rubino, A.; Sapio, A.; La Scala, M. (2021): Handbook of energy economics and policy, 239-269. (The text focuses on both electricity and natural gas markets. For the purposes of this lecture, the relevant information is on electricity, however, for later reference, read the whole chapter).